What's the difference between AWD and 4WD? I was handed the keys to the brand new BMW M5, which can actually switch between 4WD and 2WD! Nothing all that impressive for any truck drivers out there, but fairly rare in the car world. Generally speaking, 4WD is selectable, and AWD is always active. The video brakes down the unique differences, how they're similar, as well as the advantages of each setup. What do you prefer? AWD or 4WD?